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Aeschynite-(Y)

Year of discovery: 1966 (Urstad mine, Norway), 1994 (Japan)

Locality list: 4 localities of aeschynite-(Y)

• Y(Ti,Nb)₂(O,OH)₆
• (Y,Ca,Fe²⁺,Th)(Ti,Nb,Ta,W)₂(O,OH)₆
• [Y³⁺][(Ti⁴⁺,Nb⁵⁺)₂(O,OH)₆]^3-

• Class: Aeschynite series
• Class: Dititanate
• Soluble in: hot HCl, H₂SO₄
• Insoluble in: HCl
• Magnetism: Paramagnetic

• Polymorph: Yttrocrasite-(Y) (Amorphous)

• Y => Nd: Aeschynite-(Nd) (Series)
• Y => Ce: Aeschynite-(Ce) (Series)

• Nb => Ta: Tantalaeschynite-(Y) (Series)

• (O,OH) => O: Polycrase-(Y)

• Color: Yellow
• Streak: White-Yellow
• Luster: Resinous
• Diaphaneity: Transparent

• Habit: Tabular, Prismatic

• Cleavage: Perfect on {100}, {010], {001} (3 planes)
• Hardness: 5
• Density: 4.9

• System: Orthorhombic
• Group: mmm, Pmna
• Lattice: a=7.5, b=11.0, c=4.2